After undergoing an MRI earlier today, Clay Buchholz has been diagnosed with a left hamstring strain. He is not scheduled to start this week at Fenway Park, but there are no plans to place him on the disabled list. Buchholz suffered the injury running the bases in the top of the second inning during his start on Saturday in San Francisco.

Dustin Pedroia was examined by Red Sox Medical Director Dr. Thomas Gill who confirmed that he has a non-displaced fracture of the medial navicular bone in his left foot. Pedroia was placed on the 15-day disabled list on Saturday after suffering the injury Friday night in San Francisco when he fouled a ball off his left foot in the top of the third inning. He is not expected to require surgery. The usual timetable for this injury is approximately six weeks to return to play.

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Victor Martinez also underwent further examination which revealed a minimally displaced fracture on the tip of his left thumb. He is also not expected to require surgery. Martinez left yesterday’s game in San Francisco after the third inning due to the injury which was sustained after having two foul balls hit off his thumb while he was behind the plate. There will be no roster move today regarding Martinez.

ROSTER MOVE: The Boston Red Sox today added infielder/outfielder Eric Patterson to the active Major League roster and designated left-handed pitcher Fabio Castro for assignment. Patterson, who was acquired from Oakland on Saturday (June 26) in exchange for minor league left-handed pitcher Fabian Williamson, will be available for tomorrow night’s game against the Tampa Bay Rays at Fenway Park, wearing No. 3.

Patterson has appeared in 45 games for the A’s this season, batting .204 (21-for-103) with five doubles, two triples, four home runs, nine RBI, 13 runs and six stolen bases. He’s played in 25 games (22 starts) in left field, seven (two starts) in center field and five (one start) at second base, committing just one error overall for a .985 combined fielding percentage at the three positions.

Castro was recalled Friday (June 25) for his second stint with the Red Sox this season, but has not appeared in a game with the club in 2010. The left-hander has made 17 appearances (five starts) for Triple-A Pawtucket this year, going 3-5 with a 6.65 ERA (32 ER/43.1 IP), 36 strikeouts and 22 walks.

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BONSER CLEARS WAIVERS: Right-handed pitcher Boof Bonser today cleared outright waivers and has chosen to become a free agent. Bonser was designated for assignment on June 18. He did not record a decision while posting an 18.00 ERA (4 ER/2.0 IP) over two relief appearances with the Red Sox in 2010.